1. An arrector pili muscle (a) is associated with each sweat gland, (b) causes the hair to stand up straight, (c) enables each hair to be stretched when wet, (d) squeezes hair upward so it can grow...

1. An arrector pili muscle (a) is associated with each sweat gland, (b) causes the hair to stand up straight, (c) enables each hair to be stretched when wet, (d) squeezes hair upward so it can grow out.

2. The stratum corneum of the epidermis contains (a) desmosomes, (b) Merkel cells, (c) glycolipids, (d) melanocytes.

 3. Vitiligo is (a) an autoimmune disorder, (b) contagious, (c) caused by the herpes simplex virus, (d) characterized by painful blisters.